AirHint found the following cheapest return flights from Auckland (AKL) to Tongatapu (TBU) in August 2025 (see full year).

Return flights

18 Aug - 26 Aug	Fiji Airways
22 Aug - 29 Aug	Fiji Airways
07 Aug - 15 Aug	Air New Zealand
05 Aug - 13 Aug	Air New Zealand
14 Aug - 21 Aug	Air New Zealand
05 Aug - 28 Aug	Air New Zealand
22 Aug - 25 Aug	Fiji Airways
25 Aug - 01 Sep	Air New Zealand
18 Aug - 25 Aug	Fiji Airways
18 Aug - 25 Aug	Air New Zealand	direct
18 Aug - 26 Aug	Air New Zealand	direct
28 Aug - 01 Sep	Fiji Airways
29 Aug - 02 Sep	Fiji Airways

Also check the deals for one-way flights from Auckland to Tongatapu in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Auckland to Tongatapu in August from 272€

Return flights